bug(md-slide-toggle): selectable area gets 100% of container width

[jefersonestevo]

Bug, feature request, or proposal:

bug

What is the expected behavior?

The selectable area from md-slide-toggle should fit to it's content

What is the current behavior?

md-slide-toggle gets 100% of the container width as selectable area

What are the steps to reproduce?

Plunker

Which versions of Angular, Material, OS, browsers are affected?

"@angular/material" :"2.0.0-beta.2"

[devversion]

Note: This would be similar to the md-checkbox.

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